Abrasive tool and mounting.



No. 881,621 'PATENTED MAR. 10, 1908. 'R. A. ROWLAND & w. J. MAHNKELIABRASIVE T601, AND MOUNTING.

APPLICATION FILED km. @1907;

anuenfozd an Abrasive Tool and ROBERT A. ltU\\'liANl) AND WILLIAM J.MAllNliE, OF-(JLEVELA N1), oiiio'.

ABRASIVE TOOL AND MOUNTING.-

No. 881,621. Specification of Letters Patent. 7 Application filedFebruary 25,1907.

Patented. March 10, 1908 Serial No. 359,087.

To all whom it may concern:

Be it known that we, Ronaar A. ROWLAND and WiLLIAM J. MAiiNnic, citizensof the United States, residing at Cleveland, in the county of Cuyahogaand State of Ohio, have inventei'l a new and useful .linprovmnent inMountii'ig, of which the following is a specification.

This invention relates to an abrasive tool intended for dressing andsmoothing marble, granite and other blocks of stone.

The object of the invention is to distribute the abrasiveliizttfllitlili such a manner that. it Will perform the greatest amountof work in a given time. This result is accomplished in two ways, first,by formin the abrasive tool in such a manner that t 1e material of whichit is composed is so arranged or dis tributed that there will be an evenwear of the under face of the tool, and'secondly, by so constructing theabrasive tool that a supply of water can be fed. continuously to allparts of it, thus keeping the'wearing face of the tool cooled, and atthe same time removing the waste material ground from the stone. Unlessthe waste material formed by the grinding away of the portions of stoneand also of the grinding surface of'the tool, it becomes guminy andinterposes a layer of Waste between the surface of the tool, and theunground surface of e stone, thusinterfering with the cutting a ction ofthe abrasive material and increasing the amount of time required togrind to the required extent.

Other objects of the invention is, to provide a holder for the abrasivematerial from which the material may be easily removed, and providemeans for quickly attaching said older to a rotating shaft, and also toprovide means for adjusting the holder and material with respect to theshaft and the stone as either the stone or the material wears away.

In the drawings forming a part of this specificati0n: igure It is a)erspective View of our abrading tool and nolder connected to the endportion of a shaft. Fig. 2 is an inverted plan view of the abrading tooiand the holder. Fig. 3 is a section on the line 33 of Fig. 2. Fig. t isa section on the line 4-4 of Fig. 2.

In these drawings A represents the abrading instrument and this ma anygrinding com osition w necessary or desire le to use, and

'ch it may be which can be formed of i the core A greater wear uponevenly and the be changed to suit various kinds of stone. T hisabradingtool is formed by molding and is octagonal in shape. Theabrading tooliis hollow and is provided"Withan interior web iconsisting'of a central .ct' re A souared in cross-section au daisohollow andv tie core is connected to the sides by radially ext'eni'ling:arms A." which extends from the corners to tlie'sii'les of the tool.This. construction is very clearly she I: in .5 it willfurthermore, benoted that the periphher than the oral walls of the tool are thie wallsof the core A and that the arm A which. practically forms divisional o1partition walls, since theyilividc the interior of the tool into fourcompartments, gradually decrease in thickness as they ap 'iroaeh thecore A. i

The object of this construction is to secure an even wear-of thegrinding face of the tool, for it will be obvious that as the tool isrotated the peripheral wall will travel at a greater speed than thccentral core portion and the outer portions of the armswill also have ahigher velocity than theinner portionsand consequently there will be athe portions of the tool most distant from the center than upon thatportion of thc'grinding surface adjacent the center. It will thereforebe obvious that if the abrasive tool was solid it would not only be muchheavier but it would also wear ran-- "lll'lillng action, therefore,would not be unilorm over all portions of the stone being operated uponat the sometime. 'ihcrel'orc, as only portions of the surface of thestone beneath the grinding tool were being acted upon at a time, thatis, that part of the surface iiimicdiatcly in contact with an. unworiiportion of the abrasive tool, a longer time would be required to grindit cerlain amount of waste material from the stone. As the grindingaction is also dependent upon the prompt removal of waste material, sothat tic abrasive tool l'inuously present a clean face; lo the stone itIHFPS-stti) to supply water to all parts oi the grinding face. 1 i

The manner of supplying the. water to the tool is, of course immaterialbut it is common. to play a hose upon the tool during the grindingoperation. \Vith a tool constructed shown in our drawings, it will beobvious that the stream of water upon the tool ivili enter the interiorcompartments as the tool is ili coir- I parts of the grin mg surface werovide both the peripheral wall, the walls the core A and the arms orpartitions A with a plu-.

rality of small transverse perforations A so that water will pass freelyand rapidly from one portion of the tool to the other, thus thoroughlycleaning and cooling all parts and 'removing ra idly all waste material.The removal of t is waste is also greatly facilitated by forming thetool hollow instead of making it solid, which would permit thecollection of waste material under the tool by preventing an effectivestream of water reac'hin the surfaces of the stone upon which the toowas rotated.

. A metal holder B is cast in the same form as the abrasive material Aand is provided with openings B, four in number correspond- I ing withthe four compartments of the abrasufficient toi hold it in place duringthe grindparallel ears sive tool. The casting B is also provided witlraflange B, and molded abrasive tool is inserted within this flange whichis normally ing action. In order, however, that there may be no-dangerof the abrasive material falling from the holder, while being liftedinto position upon the stone, we-form slots in the marginal ortions ofthe holder B and drive wedges into these slots, which wedges bearagainst sides of the abrasive tool and lock the sametightly in theholder B. Centrally u on the holder 3 we form ."l which are providedwith a plurality of alining perforations D. The shaft E is rotated inany convenient manner and this shaft is provided at its lower end withears E between which 1 are ivotally held a sleeve or coupling member Jand a pin- E The pin E pa'sses through one set being transversel ofalining perforations D". By changing the in from one set of perforationsto the other, It will be obvious that the tool may be raised or loweredwith reference to the stone.

The octagonal shape of the tool possesses advantages over a circularshape and especially in the two following partroularsz-An annular blockwill not slip in the holder as might be the case of one circular informand held in a circular holder. In case the stone has ridges upon it, theangles of the face of the block aid in grinding away said ridges whereasa cylindrical block having a circular bottom or wearing surface would belikely to ride upon such ridges as the tool was moved while rotatingback and forth upon the stone.

Having thus fully described our invention, what we claim as new anddesire to secure by Letters Patent, is

1. A grinding tool consisting of a rectangular hollow block of moldedabrasive ma terial a central core therein, and radial arms connectingthe central core and the sides of the block, said arms formingpartitions dividing the interior of the block into com-- partments, saidpartitions and core being transversely perforated. A

2. A grindmg tool of the kind described consistin of a block of abrasivematerial oetagona in form and hollow, a web formed upon the interior oftho block and com rising a core and radial arms, said core an armsperforated, the sides of the block being 0 greater thickness than thewalls of the core and the radial arms decreasing in thickness as theyapproach the core.

ROBT. A. ROWLAND. WILLIAM J. MAHNKE. Witnesses:

GEO. H. CAMP, (hIAnLEs S. WILMOT.

